Exploring Dynamic Characteristics of Key Joint Surface of High-precision Vertical Grinding Machine Tool
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摘要: 机床的结合面是整机动态特性的薄弱环节。应用实验测试和计算机仿真, 对机床结合面的动态特性进行研究, 以提升整机的动态性能。针对磨床中螺栓连接的关键结合面, 建立考虑法向和切向刚度的三维接触刚度模型。将实验测试结果与有限元分析相对比, 验证所建结合面模型的正确性。应用该模型, 采用增加螺栓个数及提高螺栓预紧力等方法, 改进结合面设计, 分析改进后的整机动态特性。该方法实现了机床整机结合部的非线性特性的合理处理, 以支持机床设计中整机性能的预测。Abstract: The joint surface of a grounding machine tool has weak dynamic characteristics, so we use experimental tests and computer simulations to study them in order to improve the performance of the grinding machine tool. We establish the three-dimensional contact stiffness model of the key joint surface of the bolt in the grinding machine tool so as to take into consideration its normal and tangential stiffness. The contact stiffness model is verified by comparing the experimental results with the finite element analysis results and is then used to improve the design of the joint surface and analyze the dynamics of the grinding machine tool. In the new design, the number of bolts is increased and the bolt preload is upgraded. The nonlinear characteristics of the grinding machine tool are correctly dealt with to predict its performance on the whole.
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Key words:
- calculations /
- computer simulation /
- dynamics /
- experiments /
- finite element method
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[1] 李磊,张胜文,于洋.滚动导轨结合面参数识别及仿真分析[J].江苏科技大学学报(自然科学版),2009,23(2):142-145 Li L,Zhang S W,Yu Y.Parameter identification and simulationanalysis of the rolling guide-way[J].Journal of Jiangsu University of Science and Technology Natural Science Edition,2009,23(2):142-145(in Chinese) [2] 赵宏林,丁庆新,曾鸣,等.机床结合部特性的理论解析及应用[J].机械工程学报,2008,(12):208-214 Zhao H L,Ding Q X,Zeng M,et al.Theoretic analysis on and application of behaviors of machine tool joints[J].Chinese Journal of Mechanical Engineering,2008,(12):208-214(in Chinese) [3] 罗卫平,王珺.基于结合面的机床动态特性研究[J].机械制造及自动化,2011,40(4):42-43 Luo W P,Wang J.Research on dynamics characteristics of machine tool based on joints[J].Machine Building and Automation,2011,40(4):42-43(in Chinese) [4] 罗卫平.刚柔耦合机械系统的建模方法[J].金陵科技学院学报,2009,(3):25-27 Luo W P.Modeling methods of machine system based on rigid-flexible coupling[J].Journal of Jinling Institute of Technology,2009,(3):25-27(in Chinese) [5] 马骏,陈永洁,申阳,等.基于ANSYS 的机床结合部建模方法探讨[J].现代机械,2011,(3):6-8Ma J,Chen Y J,Shen Y,et al.Research on the meth-ods of modeling the joints of machine-tools based on AN-SYS[J].Modern Machinery,2011,(3):6-8(in Chinese) [6] 杨浩,秦萍,李柏林,等.基于ANSYS的落地式镗铣床模态分析[J].机床与液压,2010,38(9):91-93 Yang H,Qin P,Li B L,et al.Modal analysis of floor type boring and milling machine tool based on ANSYS[J].Machine Tool and Hydraulics,2010,38(9):91-93(in Chi-nese) [7] 毛宽民,黄小磊,田红亮,等.机床固定结合面参数识别及其拟合方法[J].华中科技大学学报,2011,(3):18-21 Mao K M,Huang X L,Tian H L.Identifying dynamic parameters of fixed joints in machine tools and its fitting method[J].J.Huazhong Univ.of Sci.and Tech..(Natural Science Edition),2011,(3):18-21(in Chinese) [8] 王书亭,李杰,刘涛,等.机械固定结合面刚度特性建模[J].华中科技大学学报,2011,(8):1-5 Wang S T,Li J,Liu T.Interfacial stiffness characteristic modeling of mechanical fixed joints[J].J Huazhong Univ.of Sci.and Tech..(Natural Science Edition),2011,(8):1-5(in Chinese) [9] 温淑花,张学良,武美先,等.结合面法向接触刚度分形模型建立与仿真[J].农业机械学报,2009,40(11):197-202 Wen S H,Zhang X L,Wu M X.Fractal model and simulation of normal contact stiffnessof joint interfaces and its simulation[J].Transactions of the Chinese Society for Agricultural Machinery,2009,40(11):197-202(in Chinese) [10] 位文明,刘海涛,张俊,等.基于实际面压力分布的结合面有限元建模方法[J].中国科技论文在线,2011,(8):563-567 Wei W M,Liu H T,Zhang J,et al.Finite element modeling method of joint surfaces based on real surfacepressure distribution[J].Sciencepaper Online,2011,(8):563-567(in Chinese) [11] 张学良.机械结合面动态基础特性理论、实验与建模研究[D].西安:西安理工大学,1998 Zhang X L.Research ondynamic basic characteristics of machine joint-theory,experiments andmodeling[D].Xi'an:Xi'an University of Technology,1998(in Chinese)
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